An oft-overlooked style of beer, ESB (extra special bitter) is a dark, malty, full-bodied brew that goes remarkably well with the warm flavors of winter stews, especially cassoulet. London-based Fuller's ESB presents hints of toffee and biscuit enlivened by a slight citrusy finish that plays nicely with the cassoulet's sugary sweet potatoes and carrots. Fuller's ­nuttiness lends even more depth to this flavorful dish.